The condition of the roads in California would be much, much better if half of Mexico weren’t driving on them.
And a lot of the cars on the road aren’t registered (or insured, no doubt). We tell everyone when they affix the current sticker onto their license plates to then take an exacto knife and slash a criss-cross over the tag, so anyone attempting to peel it off and put on their unregistered vehicle will end up with crumbled bits and pieces. SIGH!